RE: [Xen-ia64-devel] RFC: ptc.ga implementation for SMP-g

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: Xu,Anthony
>Sent: 2006年4月5日 9:50
>
>Let's first analyze how linux uses ptc.ga.
>
>In linux, a process is only running on a LP at one time, is this
>correct?

Linux allows two processes to share same address space. In that case, 
it's possible that two LPs refer to same page table simultaneously. So this 
assertion doesn't hold true. :-)

Thanks,
Kevin
>
>Linux kernel (on behalf of a process that is running) uses ptc.ga to
>purge this
>process's tlbs. But linux kernel will not purge processes' tlbs those
>are not
>running on this LP, this is my understanding, if linux kernel does purge
>other
>processes those are not running on this LP, linux kernel will reset
>region
>registers, I didn't see this code.   Is this correct?
>
>If above two are all correct.
>When a process running on vcpu1 is executing ptc.ga,
>This process is not running on vcpu2 at the same time,
>that means the tlbs which ptc.ga wants to purge is not used on vcpu2
>until this process is scheduled to vcpu2.
>Before this process is scheduled to vcpu2, guest kernel will
>Reset region registers for this process, and then hypervisor gets
>control to
>purge the tlbs.
>
>Comments welcome
>
>>Dan
>
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